How does it go backwards?

[Eric7]

I understand

1.  The trike can go backwards on electric power alone.
2.  There is not much drag on the trike going forward if you do not use electricity - indicating a ratchet system.
3.  The power hub is a geared hub - not a direct drive.

I am wondering how this is done.  I understand geared hubs only go forward with a ratchet system so it can only turn one way. That way, when the motor is not running, the motor is not a drag force on the rotation. 

So how does a geared hub with a ratchet system go backwards?  Maybe my assumption is incorrect and the geared hub engaged 100% of the time with no ratchet system?